化合物

The direct incorporation of U-13C glucose was estimated by the intensity increase of m/z to F(F was parent fragment, and n was the carbon number in the fragment), while the total isotope incorporation from the added 13C could be calculated according to the abundance ratio increment summation from m/z (Fa+1) through (Fa was the fragment containing all original skeleton carbons, and T was the carbon number in the amino acid molecule). The 13C enrichment in the target compound was expressed as atom percentage excess, and that of D-amino acid needed to be corrected by the coefficient of hydrolysis-induced racemization. The 13C enrichment reflected the carbon turnover velocity of individual amino acid enantiomers, and was powerful to investigate the dynamics of soil amino acids.

外加葡萄糖直接合成氨基酸的比例可利用质谱碎片的相对强度变化来评价（n为质谱碎片F中含有的碳原子数目）；而源于葡萄糖的13C同位素在氨基酸分子中的富集程度是所有同位素峰相对强度变化的总和。13C在目标化合物中的富集比例用原子百分超评价，D氨－基酸的APE还需进一步利用水解诱导的外消旋化系数校正。13C在目标化合物中的富集程度可反映各氨基酸手性异构体的碳循环速率大小，是研究土壤氨基酸动态变化的有力工具。

Preliminary bioassay showed that most of title compounds had better herbicidal activity,for example,5a,5b,5c,5e,5f and 5g exhibited more than 80% inhibition to broad-leaved weeds,such as Abutilon theophrasti,Chenopodium album L.,Amaranth...

初步生物活性测定结果表明，该类化合物对阔叶杂草具有较好的芽后除草活性，如5 a、5b、5 c、5 e、5 f、5g等化合物在75 g/hm2剂量下，茎叶处理对苘麻、藜、凹头苋等阔叶杂草的抑制率达80%以上。

There is high value of Acetamide, N, Ndi ethy in degraded and water-washed crude oils.

胺及酰胺类化合物是一类受控因素多和形成机制复杂的生物标记化合物。

Two compounds were isolated from ethyl acetate extract of the fermentation of fungus 07-11,which obtained from the soil of Yunnan Province. They were identified as N-(4-hydroxy-2-methoxyphenyl)acetamide (1) and ergosta-7,22-diene-3,6-dione (2) respectively on the basis of spectral analyses and physical and chemical identifications.

从云南土壤真菌07-11号菌株的发酵液乙酸乙酯萃取物中分离得到2个化合物，通过理化鉴别和光谱测定，鉴定两化合物分别为N-(4-羟基-2-甲氧苯基)乙酰胺(1)和麦角甾7，22-二烯-3，6-二酮(2)。

We further investigated the molecular mechanism of unusual superhydrophobicity of fluorocarbons.

和碳氢化合物相比，碳氟化合物的极性更强，和水的静电相互作用也更强，这使得碳氟化合物的超疏水性更加不同寻常。

Methods Synthesis 3-O-carbamylnoviose and 3-acetamido-7-hydroxycoumarin, compare the activity of inhibit K562 cell with novobiocin by MTT.

合成新生霉素的结构单元3-O-氨基甲酰基诺维糖（化合物2）和3-乙酰氨基-7-羟基香豆素（化合物3），MTT法测定两化合物与新生霉素抗K562细胞的活性。

The chemistry of transition-metal-containing aromatic compounds is attracting increasing research interests because they show the aromaticity as well as the reactivities of organometallics.

金属杂芳香化合物由于兼具金属有机化合物和芳香化合物的性质而日益引起人们的研究兴趣。

Their formulas are presented as following:( 1 ) [Co2C6H2(COO44]n ( 2 ){[Co2(C2O4)C6H2(COO4(H2O)4] -4H2O-(NH2CH2COOH)}n ( 3 ){[Co(H2O)6][Co(H2O)4C6H2(COO4] . 4H2O}n These coordination polymers have been characterized by IR,UV-VIS-NIR spectroscopes. The variable temperature magnetic susceptibilities(1.5-300K)of complex (1) and (2) have been measured and studied. Complex (1) and (2) exhibit the anti-ferromagnetic property. The spin-transition phenomenon of complex (2) takes place at 17K.

经X-光衍射测定，确定了它们的结构，分子式如下：(1)[Co_2C_6H_2(COO_4_4]_n (2){[Co_2(C_2O_4)C_6H_2(COO_4(H_2O)_4]·4H_2O·(NH_2CH_2COOH)}_n (3){[Co(H_2O)_6][Co(H_2O)_4C_6H_2(COO_4]·4H_2O}_n 研究了上述三种配位聚合物的红外，紫外—可见—近红外光谱，测定了化合物(1)和(2)在1.5—300K温度范围内的变温磁矩，对它们的磁性研究表明，化合物(1)和(2)均呈反铁磁性，并且化合物(2)在17K发生了自旋转换现象。

A molecular or ionic substance capable of combining with a proton to form a new substance.

化合物：能与质子结合形成一种新物质的分子化合物或离子化合物

In the first chapter, two reviews on the synthesis of nitrogen compounds fromcarbohydrates and the synthesis of pyridines by Diels-Alder reaction were introducedrespectively.

第一章简要介绍了以碳水化合物为原料合成含氮杂环化合物的研究进展和以Diels-Alder反应合成吡啶类化合物的研究进展，确定了本论文的研究课题。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。